Reciprocal immune-epithelial interaction during breast cancer induction

Area of Science:

• Immunology
• Cancer Biology
• Cellular Crosstalk

Background:

• Immune editing (elimination, equilibrium, escape) is established for transformed cells.
• The pre-transformation phases (inflammation, initiation, inception) are less understood.
• These phases are influenced by "three I's": inflammation, initiation, and inception of malignancy.

Purpose of the Study:

• Introduce the concept of "reciprocal learning" between epithelial and immune cells.
• Define reciprocal learning as lifelong crosstalk in non-diseased tissue.
• Explore the role of this crosstalk in cancer prevention, particularly breast cancer.

Main Methods:

• Conceptual framework based on existing research.
• Analysis of immune cell presence and activity in normal breast tissue across the lifespan.
• Integration of findings on epithelial-immune cell interactions.

Main Results:

• Epithelial cells and macrophages facilitate immune cell learning through genetic/epigenetic alterations.
• Epithelial cells modulate MHC and antigen presentation machinery to inform immune recognition.
• Immune cells are present and surveil breast epithelium throughout development, cycling, lactation, and involution.

Conclusions:

• Reciprocal learning provides immune memory for responding to epithelial dysregulation.
• This lifelong immune surveillance may be a key factor in preventing cancer.
• The concept offers a new perspective on the interplay between immunity and epithelial health.